US20230209687A1 - Dimming data transmission device - Google Patents
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- US20230209687A1 US20230209687A1 US17/927,127 US202117927127A US2023209687A1 US 20230209687 A1 US20230209687 A1 US 20230209687A1 US 202117927127 A US202117927127 A US 202117927127A US 2023209687 A1 US2023209687 A1 US 2023209687A1
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- 239000004973 liquid crystal related substance Substances 0.000 claims description 49
- 230000008054 signal transmission Effects 0.000 claims description 39
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- 238000000034 method Methods 0.000 claims description 14
- 238000004891 communication Methods 0.000 description 38
- 238000013507 mapping Methods 0.000 description 19
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
- H05B47/175—Controlling the light source by remote control
- H05B47/18—Controlling the light source by remote control via data-bus transmission
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
- H05B47/105—Controlling the light source in response to determined parameters
- H05B47/11—Controlling the light source in response to determined parameters by determining the brightness or colour temperature of ambient light
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
- G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
- G09G3/3426—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines the different display panel areas being distributed in two dimensions, e.g. matrix
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
-
- B60K2370/1529—
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
- B60K35/20—Output arrangements, i.e. from vehicle to user, associated with vehicle functions or specially adapted therefor
- B60K35/21—Output arrangements, i.e. from vehicle to user, associated with vehicle functions or specially adapted therefor using visual output, e.g. blinking lights or matrix displays
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- G—PHYSICS
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- G09G2320/00—Control of display operating conditions
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- G09G2320/0626—Adjustment of display parameters for control of overall brightness
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
- G09G2320/0646—Modulation of illumination source brightness and image signal correlated to each other
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Definitions
- the invention disclosed herein relates to a method of dimming and transmission of dimming data.
- Patent Document 1 Japanese unexamined patent application publication No. 2017-35980
- each display device includes a liquid crystal display panel and a backlight unit.
- the single control device needs to transmit dimming data.
- a local dimming control as the dimming control in the liquid crystal display device, it is possible to achieve an improved contrast ratio of an image displayed by the liquid crystal display device.
- a dimming data transmission device includes a determination unit configured to determine whether each of a plurality of divided regions, into which a lightable region of an illumination device is divided, is a light-on region or a light-off region, and a transmission unit configured to transmit dimming data to dim only such a divided region of the divided regions as is serving as the light-on region.
- an image display system includes an image signal transmission device including the above-configured dimming data transmission device in which the illumination device is a backlight unit of a liquid crystal display device and configured to transmit dimming data and an image signal, an image signal reception device configured to receive the dimming data and the image signal transmitted from the image signal transmission device, a liquid crystal display panel, and a backlight unit configured to irradiate the liquid crystal display panel with light.
- the liquid crystal display panel is configured to display an image based on the image signal received by the image signal reception device
- the backlight unit is configured to emit light based on the dimming data received by the image signal reception device.
- a vehicle includes the above-configured dimming data transmission device or the above-configured image display system.
- dimming data transmission device With a dimming data transmission device disclosed herein, it is possible to significantly reduce the data amount of dimming data.
- FIG. 1 is an exterior view of a vehicle.
- FIG. 2 is a diagram showing an interior of a vehicle.
- FIG. 3 is a block diagram showing a configuration of an image display system according to a first embodiment.
- FIG. 4 A is a diagram showing an example of a fixed pattern.
- FIG. 4 B is a diagram showing an example of a display image.
- FIG. 5 is a flow chart showing a dimming-data related operation of the image display system according to the first embodiment.
- FIG. 6 is a schematic diagram showing a frame configuration of an image signal.
- FIG. 7 is a block diagram showing a configuration of an image display system according to a second embodiment.
- FIG. 8 is a block diagram showing a configuration of an image display system according to a third embodiment.
- FIG. 9 is a block diagram showing a configuration of an image display system according to a fourth embodiment.
- FIG. 10 is a block diagram showing a configuration of an image display system according to a fifth embodiment.
- FIG. 11 is a block diagram showing a configuration of an image display system according to a sixth embodiment.
- FIG. 12 is a block diagram showing a configuration of an image display system according to a seventh embodiment.
- An image display system 1 A according to a first embodiment (hereinafter abbreviated as “the image display system 1 A”), details of which will be described later, is mounted on a vehicle 101 shown in FIG. 1 , for example.
- the image display system 1 A includes at least part of the following for example: a center information display (CID) 102 that performs car-navigation map display and so on; an instrument cluster 103 ; display devices 104 L and 104 R of an electronic side mirror system; and a head-up display (HUD) 105 (see FIG. 2 ).
- a center information display (CID) 102 that performs car-navigation map display and so on
- an instrument cluster 103 that performs car-navigation map display and so on
- display devices 104 L and 104 R of an electronic side mirror system and a head-up display (HUD) 105 (see FIG. 2 ).
- HUD head-up display
- the instrument cluster 103 may include a single liquid crystal display device that performs display regarding a plurality of measuring instruments, or may include a plurality of liquid crystal display devices, each of which performs display regarding at least one measuring instrument.
- the HUD 105 projects, onto the windshield of the vehicle 101 , an image displayed by a liquid crystal display device in the HUD 105 , and thereby displays a virtual image to a driver of the vehicle 101 .
- the image display system 1 A includes one liquid crystal display device 4 .
- FIG. 3 is a block diagram showing a configuration of the image display system 1 A.
- the image display system 1 A includes an image signal transmission device 2 , an image signal reception device 3 , and the liquid crystal display device 4 .
- the image signal transmission device 2 transmits dimming data and an image signal to the image signal reception device 3 .
- the image signal transmission device 2 includes an image signal transmission unit 20 .
- the image signal transmission unit 20 includes a dimming data transmission device 21 .
- the image signal transmission unit 20 and the dimming data transmission device 21 may be separately provided.
- the dimming data transmission device 21 includes a determination unit 22 , a classifying unit 23 , and a transmission unit 24 .
- the determination unit 22 determines whether each of a plurality of divided regions, into which a lightable region of a backlight unit 41 is divided, is a light-on region or a light-off region.
- the backlight unit 41 is a direct backlight unit provided in the liquid crystal display device 4 .
- a later-described second driving unit 43 according to dimming data, turns on only such a light emitting diode (LED) as belongs to the light-on region of the backlight unit 41 . With this configuration, it is possible to achieve an improved contrast ratio of a display image of the liquid crystal display device 4 .
- the lightable region (the backlight front face) of the backlight unit 41 is, as shown in FIG. 4 A , divided into 32 divided regions R 1 to R 32 in a matrix pattern.
- the determiner 22 has determined that the divided regions R 1 to R 5 , R 8 , R 11 , R 14 to R 17 , R 19 , R 22 , R 24 to R 27 , and R 30 to R 32 are light-on regions, and the divided regions R 6 to R 7 , R 9 to R 10 , R 12 to R 13 , R 18 , R 20 to R 21 , R 23 , and R 28 to R 29 are light-off regions.
- the result of determination by the determination unit 22 is referred to as a fixed pattern.
- the fixed pattern shown in FIG. 4 A is suitable for the display image shown in FIG. 4 B , for example. Note that, although the number of divided regions in the above description is 32 for simplicity of the figure, it is actually desirable that the number be on the order of 100 to 6000, for example.
- the classifying unit 23 classifies all such divided regions as have been determined to be light-on regions into a number of groups, the number being smaller than a number of all such divided regions as have been determined to be light-on regions.
- the classifying unit 23 in the example shown in FIG. 4 A , may classify the divided regions R 6 and R 7 into a first group, the divided regions R 9 , R 10 , and R 18 into a second group, the divided regions R 12 , R 13 , R 20 , R 21 , R 28 , and R 29 into a third group, and the divided region R 23 into a fourth group.
- such light-on regions as are adjacent to each other at least either horizontally or vertically together form a group.
- the classifying unit 23 may classify the divided regions R 6 , R 7 , R 9 , R 10 , R 12 , R 13 , R 18 , R 20 , R 21 , R 23 , R 28 , and R 29 into one group.
- dimming data is data that allows dimming to be performed individually on a group-by-group basis. Accordingly, the smaller the number of groups is, the more the data amount of dimming data can be reduced.
- the dimming data transmission device 21 does not include the classifying unit 23 . In that case, dimming data is data that allows dimming to be performed individually on a one-by-one basis of the light-on regions.
- the transmission unit 24 transmits dimming data for dimming only a divided region serving as a light-on region.
- the dimming data does not include any data for dimming a divided region serving as a light-off region. Accordingly, the data amount of dimming data can be reduced.
- the image signal reception device 3 receives dimming data and an image signal from the image signal transmission device 2 .
- the image signal reception device 3 includes a signal processing unit 30 and a vehicle communication unit 36 .
- the signal processing unit 30 includes an image signal reception unit 31 , an abnormality detection unit 33 , a mapping setting unit 34 , and a dimming data conversion unit 35 .
- the image signal reception unit 31 includes a local dimming setting extraction unit 32 .
- the signal processing unit 30 may use, for example, a timing controller, a low voltage differential signaling (LVDS) bridge integrated circuit (IC), a video large scale integration (LSI), etc.
- LVDS low voltage differential signaling
- IC integrated circuit
- LSI video large scale integration
- the image signal reception unit 31 receives an image signal transmitted from the image signal transmission device 2 .
- the image signal reception unit 31 also receives fixed pattern information and dimming data which are transmitted from the image signal transmission device 2 .
- the local dimming setting extraction unit 32 extracts local dimming setting (the fixed pattern information and the dimming data) from the signal and so on transmitted from the image signal transmission device 2 .
- the abnormality detection unit 33 detects an abnormality in image data output from the image signal reception unit 31 . If no abnormality is detected in the image data, the abnormality detection unit 33 outputs the image data to a first driving unit 42 of the liquid crystal display device 4 .
- the mapping setting unit 34 performs mapping of the dimming data extracted by the local dimming setting extraction unit 32 onto a light-on region or light-on regions specified by the fixed pattern information.
- the dimming data conversion unit 35 adds, to an output of the mapping setting unit 34 , dimming data corresponding to a light-off region or light-off regions of the backlight unit 41 , and thereby converts the output of the mapping setting unit 34 into dimming data to be output to the liquid crystal display device 4 .
- the dimming data conversion unit 35 outputs the converted dimming data to the second driving unit 43 of the liquid crystal display device 4 .
- the vehicle communication unit 36 via an in-vehicle communication network, such as Local Interconnect Network (LIN), Controller Area Network (CAN), Media Oriented Systems Transport (MOST), Cock Extension Peripheral Interface (CXPI), or Ethernet, performs communication of various kinds of information with other components (including the image signal transmission device 2 ) mounted in the same vehicle.
- LIN Local Interconnect Network
- CAN Controller Area Network
- MOST Media Oriented Systems Transport
- CXPI Cock Extension Peripheral Interface
- Ethernet performs communication of various kinds of information with other components (including the image signal transmission device 2 ) mounted in the same vehicle.
- the liquid crystal display device 4 includes a liquid crystal display panel 40 , the backlight unit 41 which irradiates the liquid crystal display panel 40 with light, the first driving unit 42 which drives the liquid crystal display panel 40 , and the second driving unit 43 which drives the backlight unit 41 .
- the liquid crystal display panel 40 displays an image based on an image signal received by the image signal reception device 3 .
- the backlight unit 41 emits light based on dimming data received by the image signal reception device 3 .
- FIG. 5 is a flow chart showing a dimming-data related operation of the image display system 1 A.
- the image signal transmission unit 20 of the image signal transmission device 2 transmits an image signal to the image signal reception unit 31 of the image signal reception device 3 (step S 1 ).
- the image signal transmission unit 20 includes the fixed pattern information and the dimming data in the image signal.
- the fixed pattern information indicates in order whether each divided region is a light-on region or a light-off region. Accordingly, in the example shown in FIG.
- the fixed pattern information indicates, in order from the divided regions R 1 to R 32 , (light-off, light-off, light-off, light-off, light-off, light-on, light-on, light-off, light-on, light-on, light-off, light-on, light-on, light-off, light-off, light-on, light-on, light-off, light-off, light-off, light-off, light-off, light-on, light-on, light-off, light-off, light-on, light-on, light-off, light-on, light-off, light-off, light-off, light-on, light-on, light-off, light-off, light-off, light-on, light-on, light-off, light-off, light-off, light-off).
- the image signal is a low voltage differential signaling (LVDS) signal.
- LVDS low voltage differential signaling
- the image signal may instead be an embedded display port (eDP) signal, an open LDI (oLDI) signal, or an MipiDSI signal.
- Each frame of the image signal includes, as shown in FIG. 6 , a display region portion
- the non-display region portion P 2 serving as a display region
- a non-display region portion P 2 serving as a non-display region
- a vertical blanking region portion P 3 serving as a vertical blanking region
- a horizontal blanking region portion P 4 serving as a horizontal blanking region.
- the number of lines in the non-display region portion P 2 is smaller than that in the vertical blanking region portion P 3 by the number of lines in the horizontal blanking region portion P 4 .
- the non-display region portion P 2 has four lines, for example.
- the image signal transmission unit 20 stores image data in the display region portion P 1 , and stores, in the non-display region portion P 2 , fixed pattern information and dimming data output from the transmission unit 24 .
- the image signal transmission unit 20 does not necessarily need to store the fixed pattern information and the dimming data in each frame. Note that, for exact synchronization with the image data, the image signal transmission unit 20 may store the fixed pattern information and the dimming data in each frame.
- step S 2 following step S 1 the image signal transmission unit 20 of the image signal transmission device 2 transmits setting information of divided regions to the image signal reception unit 31 of the image signal reception device 3 .
- the image signal transmission unit 20 includes the setting information of the divided regions in the image signal.
- the setting information of the divided regions includes the number of divisions ( 32 in the example shown in FIG. 4 A ) and position information of each divided region (information regarding to which pixel in the image data each divided region corresponds).
- step S 3 following step S 2 the local dimming setting extraction unit 32 extracts the fixed pattern information from the image signal.
- step S 4 following step S 3 the abnormality detection unit 33 detects whether or not there is an abnormality in the image data.
- the abnormality detection unit 33 detects whether or not there is an abnormality with respect to only image data corresponding to a light-on region. This is because even if there is an abnormality in image data corresponding to a light-off region, it has no effect on a display image.
- the abnormality detection unit 33 may detect whether or not there is an abnormality with respect to only image data corresponding to a light-off region, or may detect whether or not there is an abnormality with respect to both image data corresponding to a light-on region and image data corresponding to a light-off region.
- the abnormality detection unit 33 may use different methods between the abnormality detection with respect to image data corresponding to a light-on region and the abnormality detection with respect to image data corresponding to a light-off region.
- the abnormality detection unit 33 may determine that image data corresponding to a light-on region is normal when a parameter regarding that image data corresponding to a light-on region is equal to or more than a threshold value, and may determine that image data corresponding to a light-off region is normal when a parameter regarding that image data corresponding to the light-off region is less than a threshold value.
- examples of adoptable methods include a method in which CRC data is included in the image data and the abnormality detection unit 33 performs abnormality detection by utilizing the CRC data, and a method in which the abnormality detection unit 33 calculates a total value of RGB data of a predetermined light-on region and performs abnormality detection based on a result of comparison between the total value and an expected value.
- examples of adoptable methods include a method in which the abnormality detection unit 33 obtains a histogram of pixel brightness of a predetermined light-on region, obtains a parameter (for example, a mean value, a medium value, etc.) based on the histogram, and performs abnormality detection based on the parameter.
- the abnormality detection unit 33 obtains a histogram of pixel brightness of a predetermined light-on period, obtains a parameter (for example, a mean value, a medium value, etc.) based on the histogram, and performs abnormality detection based on the parameter, it is only the pixel brightness that is checked, and thus the method is an abbreviated method of abnormality detection.
- the abnormality detection unit 33 notifies the image signal transmission device 2 of the abnormality, and the image data is not output to the liquid crystal display device 4 (step S 5 ).
- the method of abnormality notification is not particularly limited, and in an exemplary method, with the image signal transmission unit 20 including a serializer and the image signal reception unit 31 including a deserializer, the abnormality detection unit 33 notifies the image signal transmission device 2 of the abnormality via I2C communication using a back channel between the serializer and the deserializer.
- the serializer converts the image signal using its unique algorithm, and sends the converted image signal to the deserializer.
- the deserializer performs, with respect to the received image signal, conversion reverse to the conversion performed by the serializer. If the abnormality notification using the I2C communication via the back channel between the serializer and the deserializer is adopted, there is no need of providing a new communication wire between the image signal transmission device 2 and the image signal reception device 3 for abnormality notification.
- the image signal reception device 3 may monitor the liquid crystal display device 4 for presence/absence of an abnormality, and may use the I2C communication via the backchannel between the serializer and the deserializer or in-vehicle communication such as LIN, CAN, MOST, CXPI, or Ethernet to notify the image signal transmission device 2 of a monitoring result.
- the abnormality detection unit 33 outputs the image data to the liquid crystal display device 4 , and the local dimming setting extraction unit 32 extracts dimming data from the image signal (step S 6 ).
- step S 7 the mapping setting unit 34 performs mapping of the dimming data having been extracted in step S 6 to a light-on region or light-on regions specified by the fixed pattern information. Further, in step S 7 , the dimming data conversion unit 35 adds, to an output of the mapping setting unit 34 , the dimming data (the lowest intensity value) corresponding to a light-off region or light-off regions of the backlight unit 41 , to thereby convert the output of the mapping setting unit 34 into dimming data to be output to the liquid crystal display device 4 . Moreover, in step S 7 , the dimming data conversion unit 35 outputs the converted dimming data to the second driving unit 43 of the liquid crystal display device 4 .
- the processing of an image signal and the processing of dimming data are completed in the signal processing unit 30 , and this facilitates the construction of the system.
- FIG. 7 is a block diagram showing a configuration of an image display system 1 B according to the second embodiment (hereinafter, abbreviated as “the image display system 1 B”).
- the image display system 1 B such parts as are identical to their counterparts in FIG. 3 are given the same reference signs as their counterparts in FIG. 3 .
- the image display system 1 B is different from the image display system 1 A in that the transmission unit 24 transmits, via the in-vehicle communication network, dimming data to the vehicle communication unit 36 of the image signal reception device 3 .
- the image display system 1 B is basically similar in configuration to the image display system 1 A.
- a dimming-data related operation of the image display system 1 B can be illustrated by the same flow chart of FIG. 5 as the dimming-data related operation of the image display system 1 A.
- the abnormality detection unit 33 outputs image data to the liquid crystal display device 4
- the local dimming setting extraction unit 32 extracts dimming data from information received by the vehicle communication unit 36 .
- the transmission unit 24 may be provided at a location away from the determination unit 22 and the classifying unit 23 .
- the liquid crystal display device 4 may be provided with an illuminance sensor and the illuminance sensor may function as the transmission unit 24 .
- the illuminance sensor may generate dimming data in accordance with a detected illuminance around the liquid crystal display device 4 , and transmit the dimming data via the in-vehicle communication network to the vehicle communication unit 36 of the image signal reception device 3 .
- FIG. 8 is a block diagram showing a configuration of an image display system 1 C according to a third embodiment (hereinafter, abbreviated as “the image display system 1 C”).
- the image display system 1 C such parts as are identical to their counterparts in FIG. 3 are given the same reference signs as their counterparts in FIG. 3 .
- the image display system 1 C is different from the image display system 1 A in that the image signal transmission unit 20 sends identification information of a fixed pattern as fixed pattern information.
- the image display system 1 C is further different from the image display system 1 A in that the mapping setting unit 34 retrieves, from a non-volatile memory 37 , an arrangement of fixed pattern.
- the image display system 1 C is basically similar in configuration to the image display system 1 A.
- the image signal transmission unit 20 sends, as fixed pattern information, information to the effect that a first fixed pattern is to be selected.
- the non-volatile memory 37 has stored therein the first fixed pattern and information indicating, in order from the divided regions R 1 to R 32 , (light-off, light-off, light-off, light-off, light-off, light-on, light-on, light-off, light-on, light-on, light-off, light-on, light-on, light-off, light-off, light-off, light-off, light-off, light-on, light-off, light-on, light-on, light-off, light-on, light-off, light-on, light-off, light-off, light-on, light-on, light-off, light-off, light-off, light-on, light-on, light-off, light-off, light-off, light-on, light-on, light-off, light-off, light-off, light-on, light-on, light-off, light-off,
- a dimming-data related operation of the image display system 1 C can be illustrated by the same flow chart of FIG. 5 as the dimming-data related operation of the image display system 1 A.
- the local dimming setting extraction unit 32 extracts, from an image signal, fixed pattern information, and the mapping setting unit 34 retrieves information linked to the fixed pattern information from the non-volatile memory 37 .
- FIG. 9 is a block diagram showing a configuration of an image display system 1 D according to a fourth embodiment (hereinafter, abbreviated as “the image display system 1 D”).
- the image display system 1 D such parts as are identical to their counterparts in FIG. 3 are given the same reference signs as their counterparts in FIG. 3 .
- the image display system 1 D is different from the image display system 1 A in that the transmission unit 24 transmits dimming data via the in-vehicle communication network to the vehicle communication unit 36 of the image signal reception device 3 , and that the image signal transmission unit 20 sends identification information of a fixed pattern as fixed pattern information.
- the image display system 1 D is further different from the image display system 1 A in that the mapping setting unit 34 retrieves an arrangement of a fixed pattern from the non-volatile memory 37 .
- the image display system 1 D is basically similar in configuration to the image display system 1 A. That is, it can be said that the image display system 1 D has a configuration obtained by combining the image display system 1 B and the image display system 1 C.
- a dimming-data related operation of the image display system 1 D can be illustrated by the same flow chart of FIG. 5 as the dimming-data related operation of the image display system 1 A.
- the local dimming setting extraction unit 32 extracts fixed pattern information from an image signal, and the mapping setting unit 34 retrieves, from the non-volatile memory 37 , information linked to the fixed pattern information.
- the abnormality detection unit 33 outputs image data to the liquid crystal display device 4
- the local dimming setting extraction unit 32 extracts dimming data from information received by the vehicle communication unit 36 .
- the transmission unit 24 may be provided at a location away from the determination unit 22 and the classifying unit 23 .
- the liquid crystal display device 4 may be provided with an illuminance sensor and the illuminance sensor may function as the transmission unit 24 .
- the illuminance sensor may generate dimming data in accordance with a detected illuminance around the liquid crystal display device 4 , and transmit the dimming data via the in-vehicle communication network to the vehicle communication unit 36 of the image signal reception device 3 .
- FIG. 10 is a block diagram showing a configuration of an image display system 1 E according to a fifth embodiment (hereinafter, abbreviated as “the image display system 1 E”).
- the image display system 1 E such parts as are identical to their counterparts in FIG. 3 are given the same reference signs as their counterparts in FIG. 3 .
- the image display system 1 E is different from the image display system 1 A in that the transmission unit 24 transmits dimming data via the in-vehicle communication network to the vehicle communication unit 36 of the image signal reception device 3 .
- the image display system 1 E is further different from the image display system 1 A in that the transmission unit 24 transmits identification information of a fixed pattern as fixed pattern information via the in-vehicle communication network to the vehicle communication unit 36 of the image signal reception device 3 .
- the image display system 1 E is still further different from the image display system 1 A in that the mapping setting unit 34 retrieves an arrangement of a fixed pattern from the non-volatile memory 37 .
- the image display system 1 E is basically similar in configuration to the image display system 1 A.
- a dimming-data related operation of the image display system 1 E can be illustrated by the same flow chart of FIG. 5 as the dimming-data related operation of the image display system 1 A.
- the local dimming setting extraction unit 32 extracts fixed pattern information from information received by the vehicle communication unit 36 , and the mapping setting unit 34 retrieves, from the non-volatile memory 37 , information linked to the fixed pattern information.
- the abnormality detection unit 33 outputs image data to the liquid crystal display device 4
- the local dimming setting extraction unit 32 extracts dimming data from the information received by the vehicle communication unit 36 .
- FIG. 11 is a block diagram showing a configuration of an image display system 1 F according to a six embodiment (hereinafter, abbreviated as “the image display system 1 F”).
- the image display system 1 F such parts as are identical to their counterparts in FIG. 10 are given the same reference signs as their counterparts in FIG. 10 .
- the image display system 1 F is different from the image display system 1 E in that the vehicle communication unit 36 has the function of the local dimming setting extraction unit 32 of the image display system 1 E.
- the image display system 1 F is basically similar in configuration to the image display system 1 E.
- a dimming-data related operation of the image display system 1 F can be illustrated by the same flow chart of FIG. 5 as the dimming-data related operation of the image display system 1 A.
- the vehicle communication unit 36 extracts fixed pattern information from information that the vehicle communication unit 36 itself has received, and the mapping setting unit 34 retrieves, from the non-volatile memory 37 , information linked to the fixed pattern information.
- the abnormality detection unit 33 outputs image data to the liquid crystal display device 4
- the vehicle communication unit 36 extracts dimming data from information that the vehicle communication unit 36 itself has received.
- FIG. 12 is a block diagram showing a configuration of an image display system 1 G according to a seventh embodiment (hereinafter, abbreviated as “the image display system 1 G”).
- the image display system 1 G such parts as are identical to their counterparts in FIG. 11 are given the same reference signs as their counterparts in FIG. 11 .
- the image display system 1 G is different from the image display system 1 F in that the vehicle communication unit 36 includes the mapping setting unit 34 and the dimming data conversion unit 35 . In other respects, the image display system 1 G is basically similar in configuration to the image display system 1 F.
- a dimming-data related operation of the image display system 1 G can be illustrated by the same flow chart of FIG. 5 as the dimming-data related operation of the image display system 1 A.
- the vehicle communication unit 36 extracts fixed pattern information from information that the vehicle communication unit 36 itself has received, and the mapping setting unit 34 in the vehicle communication unit 36 retrieves, from the non-volatile memory 37 , information linked to the fixed pattern information.
- the abnormality detection unit 33 outputs image data to the liquid crystal display device 4
- the vehicle communication unit 36 extracts dimming data from information that the vehicle communication unit 36 itself has received.
- the processing of dimming data is completed in the vehicle communication unit 36 , and this facilitates the construction of the system.
- the backlight unit 41 of the liquid crystal display device 4 is the illumination device, but the illumination device may be something other than the backlight unit 41 of the liquid crystal display device 4 .
- the dimming data transmission devices described above may be used in a case, for example, where an LED lamp provided on the outside of a vehicle is used as an adaptive driving beam (ADB) lamp, an animation lamp for displaying animation of an arrow mark, an emoticon, and the like, etc.
- ADB adaptive driving beam
- a dimming data transmission device includes a determination unit configured to determine whether each of a plurality of divided regions, into which a lightable region of an illumination device is divided, is a light-on region or a light-off region, and a transmission unit configured to transmit dimming data to dim only such a divided region of the divided regions as is serving as the light-on region (a first configuration).
- the dimming data transmission device having the first configuration, the data amount of dimming data can be reduced significantly.
- the dimming data transmission device having the first configuration described above may further include a classifying unit configured to classify all such ones of the divided regions as are each serving as the light-on region into a number of groups, the number being smaller than a number of all the such ones of the divided regions as are each serving as the light-on region.
- the dimming data is data that allows dimming of the groups individually on a group-by-group basis (a second configuration).
- the dimming data transmission device having the second configuration With the dimming data transmission device having the second configuration, the smaller the number of the groups, the more the data amount of dimming data can be reduced.
- the number of the groups may be one (a third configuration).
- the dimming data transmission device having the third configuration since the number of the groups is one, the data amount of dimming data can be reduced the most.
- the illumination device may be a backlight unit of a liquid crystal display device (a fourth configuration).
- the transmission unit may be configured to perform signal processing of storing the dimming data in a non-display region portion of an image signal including a display region portion, the non-display region portion, and a blanking region portion, and to transmit the image signal having been subjected to the signal processing (a fifth configuration).
- the dimming data transmission device having the fifth configuration, it is possible to make effective use of a non-display region portion of an image signal to transmit the dimming data.
- An image display system disclosed herein includes an image signal transmission device including the dimming data transmission device having the fourth or fifth configuration described above and configured to transmit dimming data and an image signal, an image signal reception device configured to receive the dimming data and the image signal transmitted from the image signal transmission device, a liquid crystal display panel, and a backlight unit configured to irradiate the liquid crystal display panel with light.
- the liquid crystal display panel is configured to display an image based on the image signal received by the image signal reception device
- the backlight unit is configured to emit light based on the dimming data received by the image signal reception device (a sixth configuration).
- the data amount of dimming data can be reduced significantly.
- the image signal reception device includes an abnormality detection unit configured to detect an abnormality only in such image data in the image signal as corresponds to the light-on region (a seventh configuration).
- the image signal reception device includes an abnormality detection unit configured to detect an abnormality in only such image data in the image signal as corresponds to the light-off region (an eighth configuration).
- the image signal reception device includes an abnormality detection unit configured to detect an abnormality using different methods between in such image data in the image signal as corresponds to the light-on region and in such image data in the image signal as corresponds to the light-off region (a ninth configuration).
- an abnormality can be appropriately detected both in such image data as corresponds to the light-on region and in such image data as corresponds to the light-off region.
- the illumination device is provided on an outside of a vehicle (a tenth configuration).
- the dimming data transmission device having the tenth configuration, with which the data amount of dimming data can be reduced significantly, is preferably used particularly in a case where an illumination device is used as an ADB lamp, an animation lamp, or the like.
- a vehicle disclosed herein includes the dimming data transmission device having any one of the first to fifth and tenth configurations described above, or the image display system having any one of the sixth to ninth configurations described above (an eleventh configuration).
- the data amount of dimming data can be reduced significantly.
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Abstract
Description
- The invention disclosed herein relates to a method of dimming and transmission of dimming data.
- As a configuration example of an image display system including a plurality of display devices, a configuration is known in which a single control device transmits an image signal to each of a plurality of display devices (see, for example, Patent Document 1 identified below).
- Patent Document 1: Japanese unexamined patent application publication No. 2017-35980
- For example, in a case where the display devices are liquid crystal display devices, each display device includes a liquid crystal display panel and a backlight unit. In the case where, as described above, a single control device performs dimming control of the backlight unit, the single control device needs to transmit dimming data. Here, for example, by adopting a local dimming control as the dimming control in the liquid crystal display device, it is possible to achieve an improved contrast ratio of an image displayed by the liquid crystal display device.
- Unfortunately, however, with the local dimming control, it is necessary to address the increase of the data amount of dimming data.
- According to one aspect of what is disclosed herein, a dimming data transmission device includes a determination unit configured to determine whether each of a plurality of divided regions, into which a lightable region of an illumination device is divided, is a light-on region or a light-off region, and a transmission unit configured to transmit dimming data to dim only such a divided region of the divided regions as is serving as the light-on region.
- According to another aspect of what is disclosed herein, an image display system includes an image signal transmission device including the above-configured dimming data transmission device in which the illumination device is a backlight unit of a liquid crystal display device and configured to transmit dimming data and an image signal, an image signal reception device configured to receive the dimming data and the image signal transmitted from the image signal transmission device, a liquid crystal display panel, and a backlight unit configured to irradiate the liquid crystal display panel with light. Here, the liquid crystal display panel is configured to display an image based on the image signal received by the image signal reception device, and the backlight unit is configured to emit light based on the dimming data received by the image signal reception device.
- According to still another aspect of what is disclosed herein, a vehicle includes the above-configured dimming data transmission device or the above-configured image display system.
- With a dimming data transmission device disclosed herein, it is possible to significantly reduce the data amount of dimming data.
-
FIG. 1 is an exterior view of a vehicle. -
FIG. 2 is a diagram showing an interior of a vehicle. -
FIG. 3 is a block diagram showing a configuration of an image display system according to a first embodiment. -
FIG. 4A is a diagram showing an example of a fixed pattern. -
FIG. 4B is a diagram showing an example of a display image. -
FIG. 5 is a flow chart showing a dimming-data related operation of the image display system according to the first embodiment. -
FIG. 6 is a schematic diagram showing a frame configuration of an image signal. -
FIG. 7 is a block diagram showing a configuration of an image display system according to a second embodiment. -
FIG. 8 is a block diagram showing a configuration of an image display system according to a third embodiment. -
FIG. 9 is a block diagram showing a configuration of an image display system according to a fourth embodiment. -
FIG. 10 is a block diagram showing a configuration of an image display system according to a fifth embodiment. -
FIG. 11 is a block diagram showing a configuration of an image display system according to a sixth embodiment. -
FIG. 12 is a block diagram showing a configuration of an image display system according to a seventh embodiment. - An
image display system 1A according to a first embodiment (hereinafter abbreviated as “theimage display system 1A”), details of which will be described later, is mounted on avehicle 101 shown inFIG. 1 , for example. In the case where theimage display system 1A is mounted on thevehicle 101 shown inFIG. 1 , theimage display system 1A includes at least part of the following for example: a center information display (CID) 102 that performs car-navigation map display and so on; aninstrument cluster 103;display devices FIG. 2 ). Note that theinstrument cluster 103 may include a single liquid crystal display device that performs display regarding a plurality of measuring instruments, or may include a plurality of liquid crystal display devices, each of which performs display regarding at least one measuring instrument. TheHUD 105 projects, onto the windshield of thevehicle 101, an image displayed by a liquid crystal display device in theHUD 105, and thereby displays a virtual image to a driver of thevehicle 101. - The following description, for simplicity, will deal with an example where the
image display system 1A includes one liquidcrystal display device 4. -
FIG. 3 is a block diagram showing a configuration of theimage display system 1A. Theimage display system 1A includes an imagesignal transmission device 2, an imagesignal reception device 3, and the liquidcrystal display device 4. - The image
signal transmission device 2 transmits dimming data and an image signal to the imagesignal reception device 3. The imagesignal transmission device 2 includes an imagesignal transmission unit 20. In this embodiment, the imagesignal transmission unit 20 includes a dimmingdata transmission device 21. Note that, unlike this embodiment, the imagesignal transmission unit 20 and the dimmingdata transmission device 21 may be separately provided. The dimmingdata transmission device 21 includes adetermination unit 22, a classifyingunit 23, and atransmission unit 24. - The
determination unit 22 determines whether each of a plurality of divided regions, into which a lightable region of abacklight unit 41 is divided, is a light-on region or a light-off region. Thebacklight unit 41 is a direct backlight unit provided in the liquidcrystal display device 4. A later-describedsecond driving unit 43, according to dimming data, turns on only such a light emitting diode (LED) as belongs to the light-on region of thebacklight unit 41. With this configuration, it is possible to achieve an improved contrast ratio of a display image of the liquidcrystal display device 4. - In this embodiment, the lightable region (the backlight front face) of the
backlight unit 41 is, as shown inFIG. 4A , divided into 32 divided regions R1 to R32 in a matrix pattern. In the example shown inFIG. 4A , thedeterminer 22 has determined that the divided regions R1 to R5, R8, R11, R14 to R17, R19, R22, R24 to R27, and R30 to R32 are light-on regions, and the divided regions R6 to R7, R9 to R10, R12 to R13, R18, R20 to R21, R23, and R28 to R29 are light-off regions. The result of determination by thedetermination unit 22 is referred to as a fixed pattern. The fixed pattern shown inFIG. 4A is suitable for the display image shown inFIG. 4B , for example. Note that, although the number of divided regions in the above description is 32 for simplicity of the figure, it is actually desirable that the number be on the order of 100 to 6000, for example. - The classifying
unit 23 classifies all such divided regions as have been determined to be light-on regions into a number of groups, the number being smaller than a number of all such divided regions as have been determined to be light-on regions. As an example of the classification, the classifyingunit 23, in the example shown inFIG. 4A , may classify the divided regions R6 and R7 into a first group, the divided regions R9, R10, and R18 into a second group, the divided regions R12, R13, R20, R21, R28, and R29 into a third group, and the divided region R23 into a fourth group. In the above classification example, such light-on regions as are adjacent to each other at least either horizontally or vertically together form a group. As another example of the classification, the classifyingunit 23, in the example shown inFIG. 4A , may classify the divided regions R6, R7, R9, R10, R12, R13, R18, R20, R21, R23, R28, and R29 into one group. - The following description will deal with a case where the fixed pattern is as in the example shown in
FIG. 4A and the number of groups classified by the classifyingunit 23 is one. - In this embodiment, dimming data is data that allows dimming to be performed individually on a group-by-group basis. Accordingly, the smaller the number of groups is, the more the data amount of dimming data can be reduced. Note that another configuration may be adopted in which, unlike this embodiment, the dimming
data transmission device 21 does not include the classifyingunit 23. In that case, dimming data is data that allows dimming to be performed individually on a one-by-one basis of the light-on regions. - The
transmission unit 24 transmits dimming data for dimming only a divided region serving as a light-on region. In other words, the dimming data does not include any data for dimming a divided region serving as a light-off region. Accordingly, the data amount of dimming data can be reduced. - The image
signal reception device 3 receives dimming data and an image signal from the imagesignal transmission device 2. The imagesignal reception device 3 includes asignal processing unit 30 and avehicle communication unit 36. Thesignal processing unit 30 includes an imagesignal reception unit 31, anabnormality detection unit 33, amapping setting unit 34, and a dimmingdata conversion unit 35. The imagesignal reception unit 31 includes a local dimming settingextraction unit 32. - The
signal processing unit 30 may use, for example, a timing controller, a low voltage differential signaling (LVDS) bridge integrated circuit (IC), a video large scale integration (LSI), etc. - The image
signal reception unit 31 receives an image signal transmitted from the imagesignal transmission device 2. In this embodiment, the imagesignal reception unit 31 also receives fixed pattern information and dimming data which are transmitted from the imagesignal transmission device 2. - The local dimming setting
extraction unit 32 extracts local dimming setting (the fixed pattern information and the dimming data) from the signal and so on transmitted from the imagesignal transmission device 2. - The
abnormality detection unit 33 detects an abnormality in image data output from the imagesignal reception unit 31. If no abnormality is detected in the image data, theabnormality detection unit 33 outputs the image data to afirst driving unit 42 of the liquidcrystal display device 4. - The
mapping setting unit 34 performs mapping of the dimming data extracted by the local dimming settingextraction unit 32 onto a light-on region or light-on regions specified by the fixed pattern information. - The dimming
data conversion unit 35 adds, to an output of themapping setting unit 34, dimming data corresponding to a light-off region or light-off regions of thebacklight unit 41, and thereby converts the output of themapping setting unit 34 into dimming data to be output to the liquidcrystal display device 4. The dimmingdata conversion unit 35 outputs the converted dimming data to thesecond driving unit 43 of the liquidcrystal display device 4. - The
vehicle communication unit 36, via an in-vehicle communication network, such as Local Interconnect Network (LIN), Controller Area Network (CAN), Media Oriented Systems Transport (MOST), Cock Extension Peripheral Interface (CXPI), or Ethernet, performs communication of various kinds of information with other components (including the image signal transmission device 2) mounted in the same vehicle. - The liquid
crystal display device 4 includes a liquidcrystal display panel 40, thebacklight unit 41 which irradiates the liquidcrystal display panel 40 with light, thefirst driving unit 42 which drives the liquidcrystal display panel 40, and thesecond driving unit 43 which drives thebacklight unit 41. The liquidcrystal display panel 40 displays an image based on an image signal received by the imagesignal reception device 3. Thebacklight unit 41 emits light based on dimming data received by the imagesignal reception device 3. -
FIG. 5 is a flow chart showing a dimming-data related operation of theimage display system 1A. - The image
signal transmission unit 20 of the imagesignal transmission device 2 transmits an image signal to the imagesignal reception unit 31 of the image signal reception device 3 (step S1). In this embodiment, the imagesignal transmission unit 20 includes the fixed pattern information and the dimming data in the image signal. In this embodiment, the fixed pattern information indicates in order whether each divided region is a light-on region or a light-off region. Accordingly, in the example shown inFIG. 4A , the fixed pattern information indicates, in order from the divided regions R1 to R32, (light-off, light-off, light-off, light-off, light-off, light-on, light-on, light-off, light-on, light-on, light-off, light-on, light-on, light-off, light-off, light-off, light-off, light-on, light-off, light-on, light-on, light-off, light-on, light-off, light-off, light-off, light-off, light-on, light-on, light-off, light-off, light-off). For example, a digital value ‘1’ may be assigned to ‘light-on’, and a digital value ‘0’ may be assigned to ‘light-off’ such that the information indicates (00000110110110000101101000011000). In this embodiment, the image signal is a low voltage differential signaling (LVDS) signal. Note that the image signal may instead be an embedded display port (eDP) signal, an open LDI (oLDI) signal, or an MipiDSI signal. - Each frame of the image signal includes, as shown in
FIG. 6 , a display region portion - P1 serving as a display region, a non-display region portion P2 serving as a non-display region, a vertical blanking region portion P3 serving as a vertical blanking region, and a horizontal blanking region portion P4 serving as a horizontal blanking region. The number of lines in the non-display region portion P2 is smaller than that in the vertical blanking region portion P3 by the number of lines in the horizontal blanking region portion P4. The non-display region portion P2 has four lines, for example.
- The image
signal transmission unit 20 stores image data in the display region portion P1, and stores, in the non-display region portion P2, fixed pattern information and dimming data output from thetransmission unit 24. The imagesignal transmission unit 20 does not necessarily need to store the fixed pattern information and the dimming data in each frame. Note that, for exact synchronization with the image data, the imagesignal transmission unit 20 may store the fixed pattern information and the dimming data in each frame. - In step S2 following step S1, the image
signal transmission unit 20 of the imagesignal transmission device 2 transmits setting information of divided regions to the imagesignal reception unit 31 of the imagesignal reception device 3. In this embodiment, the imagesignal transmission unit 20 includes the setting information of the divided regions in the image signal. The setting information of the divided regions includes the number of divisions (32 in the example shown inFIG. 4A ) and position information of each divided region (information regarding to which pixel in the image data each divided region corresponds). - In step S3 following step S2, the local dimming setting
extraction unit 32 extracts the fixed pattern information from the image signal. - In step S4 following step S3, the
abnormality detection unit 33 detects whether or not there is an abnormality in the image data. In this embodiment, theabnormality detection unit 33 detects whether or not there is an abnormality with respect to only image data corresponding to a light-on region. This is because even if there is an abnormality in image data corresponding to a light-off region, it has no effect on a display image. However, unlike in this embodiment, theabnormality detection unit 33 may detect whether or not there is an abnormality with respect to only image data corresponding to a light-off region, or may detect whether or not there is an abnormality with respect to both image data corresponding to a light-on region and image data corresponding to a light-off region. Note that, in detecting whether or not there is an abnormality in image data corresponding to a light-on region and in image data corresponding to a light-off region, theabnormality detection unit 33 may use different methods between the abnormality detection with respect to image data corresponding to a light-on region and the abnormality detection with respect to image data corresponding to a light-off region. For example, in a case of analog image data, which will be described later, theabnormality detection unit 33 may determine that image data corresponding to a light-on region is normal when a parameter regarding that image data corresponding to a light-on region is equal to or more than a threshold value, and may determine that image data corresponding to a light-off region is normal when a parameter regarding that image data corresponding to the light-off region is less than a threshold value. - In a case of digital image data, examples of adoptable methods include a method in which CRC data is included in the image data and the
abnormality detection unit 33 performs abnormality detection by utilizing the CRC data, and a method in which theabnormality detection unit 33 calculates a total value of RGB data of a predetermined light-on region and performs abnormality detection based on a result of comparison between the total value and an expected value. - In the case of analog image data, examples of adoptable methods include a method in which the
abnormality detection unit 33 obtains a histogram of pixel brightness of a predetermined light-on region, obtains a parameter (for example, a mean value, a medium value, etc.) based on the histogram, and performs abnormality detection based on the parameter. In the method in which theabnormality detection unit 33 obtains a histogram of pixel brightness of a predetermined light-on period, obtains a parameter (for example, a mean value, a medium value, etc.) based on the histogram, and performs abnormality detection based on the parameter, it is only the pixel brightness that is checked, and thus the method is an abbreviated method of abnormality detection. - In a case where an abnormality is detected in the image data (YES in step S4), the
abnormality detection unit 33 notifies the imagesignal transmission device 2 of the abnormality, and the image data is not output to the liquid crystal display device 4 (step S5). The method of abnormality notification is not particularly limited, and in an exemplary method, with the imagesignal transmission unit 20 including a serializer and the imagesignal reception unit 31 including a deserializer, theabnormality detection unit 33 notifies the imagesignal transmission device 2 of the abnormality via I2C communication using a back channel between the serializer and the deserializer. The serializer converts the image signal using its unique algorithm, and sends the converted image signal to the deserializer. The deserializer performs, with respect to the received image signal, conversion reverse to the conversion performed by the serializer. If the abnormality notification using the I2C communication via the back channel between the serializer and the deserializer is adopted, there is no need of providing a new communication wire between the imagesignal transmission device 2 and the imagesignal reception device 3 for abnormality notification. Note that the imagesignal reception device 3 may monitor the liquidcrystal display device 4 for presence/absence of an abnormality, and may use the I2C communication via the backchannel between the serializer and the deserializer or in-vehicle communication such as LIN, CAN, MOST, CXPI, or Ethernet to notify the imagesignal transmission device 2 of a monitoring result. - In contrast, in a case where no abnormality has been detected in the image data (NO in step S4), the
abnormality detection unit 33 outputs the image data to the liquidcrystal display device 4, and the local dimming settingextraction unit 32 extracts dimming data from the image signal (step S6). - In step S7 following step S6, the
mapping setting unit 34 performs mapping of the dimming data having been extracted in step S6 to a light-on region or light-on regions specified by the fixed pattern information. Further, in step S7, the dimmingdata conversion unit 35 adds, to an output of themapping setting unit 34, the dimming data (the lowest intensity value) corresponding to a light-off region or light-off regions of thebacklight unit 41, to thereby convert the output of themapping setting unit 34 into dimming data to be output to the liquidcrystal display device 4. Moreover, in step S7, the dimmingdata conversion unit 35 outputs the converted dimming data to thesecond driving unit 43 of the liquidcrystal display device 4. - In the
image display system 1A, the processing of an image signal and the processing of dimming data are completed in thesignal processing unit 30, and this facilitates the construction of the system. -
FIG. 7 is a block diagram showing a configuration of animage display system 1B according to the second embodiment (hereinafter, abbreviated as “theimage display system 1B”). InFIG. 7 , such parts as are identical to their counterparts inFIG. 3 are given the same reference signs as their counterparts inFIG. 3 . - The
image display system 1B is different from theimage display system 1A in that thetransmission unit 24 transmits, via the in-vehicle communication network, dimming data to thevehicle communication unit 36 of the imagesignal reception device 3. In other respects, theimage display system 1B is basically similar in configuration to theimage display system 1A. - Accordingly, a dimming-data related operation of the
image display system 1B can be illustrated by the same flow chart ofFIG. 5 as the dimming-data related operation of theimage display system 1A. However, in theimage display system 1B, in step S6, theabnormality detection unit 33 outputs image data to the liquidcrystal display device 4, and the local dimming settingextraction unit 32 extracts dimming data from information received by thevehicle communication unit 36. - Here, unlike in this embodiment, the
transmission unit 24 may be provided at a location away from thedetermination unit 22 and the classifyingunit 23. For example, the liquidcrystal display device 4 may be provided with an illuminance sensor and the illuminance sensor may function as thetransmission unit 24. The illuminance sensor may generate dimming data in accordance with a detected illuminance around the liquidcrystal display device 4, and transmit the dimming data via the in-vehicle communication network to thevehicle communication unit 36 of the imagesignal reception device 3. -
FIG. 8 is a block diagram showing a configuration of animage display system 1C according to a third embodiment (hereinafter, abbreviated as “theimage display system 1C”). InFIG. 8 , such parts as are identical to their counterparts inFIG. 3 are given the same reference signs as their counterparts inFIG. 3 . - The
image display system 1C is different from theimage display system 1A in that the imagesignal transmission unit 20 sends identification information of a fixed pattern as fixed pattern information. Theimage display system 1C is further different from theimage display system 1A in that themapping setting unit 34 retrieves, from anon-volatile memory 37, an arrangement of fixed pattern. In other respects, theimage display system 1C is basically similar in configuration to theimage display system 1A. - In the
image display system 1C, for example, the imagesignal transmission unit 20 sends, as fixed pattern information, information to the effect that a first fixed pattern is to be selected. Thenon-volatile memory 37 has stored therein the first fixed pattern and information indicating, in order from the divided regions R1 to R32, (light-off, light-off, light-off, light-off, light-off, light-on, light-on, light-off, light-on, light-on, light-off, light-on, light-on, light-off, light-off, light-off, light-off, light-on, light-off, light-on, light-on, light-off, light-on, light-off, light-off, light-off, light-off, light-on, light-on, light-off, light-off, light-off), in such a manner that the first fixed pattern and this information are linked to each other. If thenon-volatile memory 37 has stored therein information regarding a plurality of fixed patterns beforehand, theimage display system 1C can change the fixed pattern. - A dimming-data related operation of the
image display system 1C can be illustrated by the same flow chart ofFIG. 5 as the dimming-data related operation of theimage display system 1A. However, in theimage display system 1C, in step S3, the local dimming settingextraction unit 32 extracts, from an image signal, fixed pattern information, and themapping setting unit 34 retrieves information linked to the fixed pattern information from thenon-volatile memory 37. - In this embodiment, as compared with the first and second embodiments, it is possible to reduce the data amount of fixed pattern information which is sent from the
image signal transmitter 20 to thesignal processor 30. -
FIG. 9 is a block diagram showing a configuration of animage display system 1D according to a fourth embodiment (hereinafter, abbreviated as “theimage display system 1D”). InFIG. 9 , such parts as are identical to their counterparts inFIG. 3 are given the same reference signs as their counterparts inFIG. 3 . - The
image display system 1D is different from theimage display system 1A in that thetransmission unit 24 transmits dimming data via the in-vehicle communication network to thevehicle communication unit 36 of the imagesignal reception device 3, and that the imagesignal transmission unit 20 sends identification information of a fixed pattern as fixed pattern information. Theimage display system 1D is further different from theimage display system 1A in that themapping setting unit 34 retrieves an arrangement of a fixed pattern from thenon-volatile memory 37. In other respects, theimage display system 1D is basically similar in configuration to theimage display system 1A. That is, it can be said that theimage display system 1D has a configuration obtained by combining theimage display system 1B and theimage display system 1C. - A dimming-data related operation of the
image display system 1D can be illustrated by the same flow chart ofFIG. 5 as the dimming-data related operation of theimage display system 1A. However, in theimage display system 1D, in step S3, the local dimming settingextraction unit 32 extracts fixed pattern information from an image signal, and themapping setting unit 34 retrieves, from thenon-volatile memory 37, information linked to the fixed pattern information. Further, in theimage display system 1D, in step S6, theabnormality detection unit 33 outputs image data to the liquidcrystal display device 4, and the local dimming settingextraction unit 32 extracts dimming data from information received by thevehicle communication unit 36. - Here, unlike in this embodiment, the
transmission unit 24 may be provided at a location away from thedetermination unit 22 and the classifyingunit 23. For example, the liquidcrystal display device 4 may be provided with an illuminance sensor and the illuminance sensor may function as thetransmission unit 24. The illuminance sensor may generate dimming data in accordance with a detected illuminance around the liquidcrystal display device 4, and transmit the dimming data via the in-vehicle communication network to thevehicle communication unit 36 of the imagesignal reception device 3. -
FIG. 10 is a block diagram showing a configuration of animage display system 1E according to a fifth embodiment (hereinafter, abbreviated as “theimage display system 1E”). InFIG. 10 , such parts as are identical to their counterparts inFIG. 3 are given the same reference signs as their counterparts inFIG. 3 . - The
image display system 1E is different from theimage display system 1A in that thetransmission unit 24 transmits dimming data via the in-vehicle communication network to thevehicle communication unit 36 of the imagesignal reception device 3. Theimage display system 1E is further different from theimage display system 1A in that thetransmission unit 24 transmits identification information of a fixed pattern as fixed pattern information via the in-vehicle communication network to thevehicle communication unit 36 of the imagesignal reception device 3. Theimage display system 1E is still further different from theimage display system 1A in that themapping setting unit 34 retrieves an arrangement of a fixed pattern from thenon-volatile memory 37. In other respects, theimage display system 1E is basically similar in configuration to theimage display system 1A. - A dimming-data related operation of the
image display system 1E can be illustrated by the same flow chart ofFIG. 5 as the dimming-data related operation of theimage display system 1A. However, In theimage display system 1E, in step S3, the local dimming settingextraction unit 32 extracts fixed pattern information from information received by thevehicle communication unit 36, and themapping setting unit 34 retrieves, from thenon-volatile memory 37, information linked to the fixed pattern information. Further, in theimage display system 1E, in step S6, theabnormality detection unit 33 outputs image data to the liquidcrystal display device 4, and the local dimming settingextraction unit 32 extracts dimming data from the information received by thevehicle communication unit 36. - In this embodiment, as compared with the first to fourth embodiments, it is possible to reduce the data amount of image signal which is sent from the image
signal transmission unit 20 to thesignal processing unit 30. -
FIG. 11 is a block diagram showing a configuration of animage display system 1F according to a six embodiment (hereinafter, abbreviated as “theimage display system 1F”). InFIG. 11 , such parts as are identical to their counterparts inFIG. 10 are given the same reference signs as their counterparts inFIG. 10 . - The
image display system 1F is different from theimage display system 1E in that thevehicle communication unit 36 has the function of the local dimming settingextraction unit 32 of theimage display system 1E. In other respects, theimage display system 1F is basically similar in configuration to theimage display system 1E. - A dimming-data related operation of the
image display system 1F can be illustrated by the same flow chart ofFIG. 5 as the dimming-data related operation of theimage display system 1A. However, in theimage display system 1F, in step S3, thevehicle communication unit 36 extracts fixed pattern information from information that thevehicle communication unit 36 itself has received, and themapping setting unit 34 retrieves, from thenon-volatile memory 37, information linked to the fixed pattern information. Further, in theimage display system 1F, in step S6, theabnormality detection unit 33 outputs image data to the liquidcrystal display device 4, and thevehicle communication unit 36 extracts dimming data from information that thevehicle communication unit 36 itself has received. - In this embodiment, as compared with the first to fourth embodiment, it is possible to reduce the data amount of image signal which is sent from the image
signal transmission unit 20 to thesignal processing unit 30. -
FIG. 12 is a block diagram showing a configuration of animage display system 1G according to a seventh embodiment (hereinafter, abbreviated as “theimage display system 1G”). InFIG. 12 , such parts as are identical to their counterparts inFIG. 11 are given the same reference signs as their counterparts inFIG. 11 . - The
image display system 1G is different from theimage display system 1F in that thevehicle communication unit 36 includes themapping setting unit 34 and the dimmingdata conversion unit 35. In other respects, theimage display system 1G is basically similar in configuration to theimage display system 1F. - A dimming-data related operation of the
image display system 1G can be illustrated by the same flow chart ofFIG. 5 as the dimming-data related operation of theimage display system 1A. However, in theimage display system 1G, in step S3, thevehicle communication unit 36 extracts fixed pattern information from information that thevehicle communication unit 36 itself has received, and themapping setting unit 34 in thevehicle communication unit 36 retrieves, from thenon-volatile memory 37, information linked to the fixed pattern information. Further, in theimage display system 1G, in step S6, theabnormality detection unit 33 outputs image data to the liquidcrystal display device 4, and thevehicle communication unit 36 extracts dimming data from information that thevehicle communication unit 36 itself has received. - In this embodiment, as compared with the first to fourth embodiment, it is possible to reduce the data amount of image signal which is sent from the image
signal transmission unit 20 to thesignal processing unit 30. - Further, in the
image display system 1G, the processing of dimming data is completed in thevehicle communication unit 36, and this facilitates the construction of the system. - Other than the embodiments described above, various technical features disclosed in this specification can be variously modified within the scope without deviating from the spirit of the technical invention.
- For instance, in the embodiments described above, the
backlight unit 41 of the liquidcrystal display device 4 is the illumination device, but the illumination device may be something other than thebacklight unit 41 of the liquidcrystal display device 4. The dimming data transmission devices described above may be used in a case, for example, where an LED lamp provided on the outside of a vehicle is used as an adaptive driving beam (ADB) lamp, an animation lamp for displaying animation of an arrow mark, an emoticon, and the like, etc. - As has been described above, a dimming data transmission device includes a determination unit configured to determine whether each of a plurality of divided regions, into which a lightable region of an illumination device is divided, is a light-on region or a light-off region, and a transmission unit configured to transmit dimming data to dim only such a divided region of the divided regions as is serving as the light-on region (a first configuration).
- With the dimming data transmission device having the first configuration, the data amount of dimming data can be reduced significantly.
- The dimming data transmission device having the first configuration described above may further include a classifying unit configured to classify all such ones of the divided regions as are each serving as the light-on region into a number of groups, the number being smaller than a number of all the such ones of the divided regions as are each serving as the light-on region. Here, the dimming data is data that allows dimming of the groups individually on a group-by-group basis (a second configuration).
- With the dimming data transmission device having the second configuration, the smaller the number of the groups, the more the data amount of dimming data can be reduced.
- In the dimming data transmission device having the second configuration described above, the number of the groups may be one (a third configuration).
- With the dimming data transmission device having the third configuration, since the number of the groups is one, the data amount of dimming data can be reduced the most.
- In the dimming data transmission device having any one of the first to third configurations described above, the illumination device may be a backlight unit of a liquid crystal display device (a fourth configuration).
- In the dimming data transmission device having the fourth configuration described above, the transmission unit may be configured to perform signal processing of storing the dimming data in a non-display region portion of an image signal including a display region portion, the non-display region portion, and a blanking region portion, and to transmit the image signal having been subjected to the signal processing (a fifth configuration).
- With the dimming data transmission device having the fifth configuration, it is possible to make effective use of a non-display region portion of an image signal to transmit the dimming data.
- An image display system disclosed herein includes an image signal transmission device including the dimming data transmission device having the fourth or fifth configuration described above and configured to transmit dimming data and an image signal, an image signal reception device configured to receive the dimming data and the image signal transmitted from the image signal transmission device, a liquid crystal display panel, and a backlight unit configured to irradiate the liquid crystal display panel with light. Here, the liquid crystal display panel is configured to display an image based on the image signal received by the image signal reception device, and the backlight unit is configured to emit light based on the dimming data received by the image signal reception device (a sixth configuration).
- With the image display system having the sixth configuration, the data amount of dimming data can be reduced significantly.
- In the image display system having the sixth configuration described above, preferably, the image signal reception device includes an abnormality detection unit configured to detect an abnormality only in such image data in the image signal as corresponds to the light-on region (a seventh configuration).
- In the image display system having the seventh configuration, such an abnormality as will not affect a display image can be left undetected.
- In the image display system having the sixth configuration described above, preferably, the image signal reception device includes an abnormality detection unit configured to detect an abnormality in only such image data in the image signal as corresponds to the light-off region (an eighth configuration).
- In the image display system having the eighth configuration, such an abnormality as will not affect a display image can be detected.
- In the image display system having the sixth configuration described above, preferably, the image signal reception device includes an abnormality detection unit configured to detect an abnormality using different methods between in such image data in the image signal as corresponds to the light-on region and in such image data in the image signal as corresponds to the light-off region (a ninth configuration).
- In the image display system having the ninth configuration, an abnormality can be appropriately detected both in such image data as corresponds to the light-on region and in such image data as corresponds to the light-off region.
- In the dimming data transmission device having any one of the first to third configurations described above, preferably, the illumination device is provided on an outside of a vehicle (a tenth configuration).
- The dimming data transmission device having the tenth configuration, with which the data amount of dimming data can be reduced significantly, is preferably used particularly in a case where an illumination device is used as an ADB lamp, an animation lamp, or the like.
- A vehicle disclosed herein includes the dimming data transmission device having any one of the first to fifth and tenth configurations described above, or the image display system having any one of the sixth to ninth configurations described above (an eleventh configuration).
- In the vehicle having the eleventh configuration, the data amount of dimming data can be reduced significantly.
- 1A˜1G image display systems according to the first to seventh embodiments
- 2 image signal transmission device
- 20 image signal transmission unit
- 21 dimming data transmission device
- 22 determination unit
- 23 classifying unit
- 24 transmission unit
- 3 image signal reception device
- 30 signal processing unit
- 31 image signal reception unit
- 32 local dimming setting extraction unit
- 33 abnormality detection unit
- 34 mapping setting unit
- 35 dimming data conversion unit
- 36 vehicle communication unit
- 37 non-volatile memory
- 4 liquid crystal display device
- 40 liquid crystal display panel
- 41 backlight unit
- 42 first driving unit
- 43 second driving unit
- 101 vehicle
- 102 CID
- 103 instrument cluster
- 104L, 104R display device
- 105 HUD
- P1 display region portion
- P2 non-display region portion
- P3 vertical blanking region portion
- P4 horizontal blanking region portion
- R1-R32 divided region
Claims (12)
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JP2020094283 | 2020-05-29 | ||
JP2020094283 | 2020-05-29 | ||
PCT/JP2021/015799 WO2021241066A1 (en) | 2020-05-29 | 2021-04-19 | Dimming data transmission device |
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US20230209687A1 true US20230209687A1 (en) | 2023-06-29 |
US11968759B2 US11968759B2 (en) | 2024-04-23 |
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JP (1) | JPWO2021241066A1 (en) |
CN (1) | CN115700005A (en) |
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JP2007172006A (en) * | 2005-12-19 | 2007-07-05 | Canon Software Inc | Slip generation system, slip generation method, program, and recording medium |
JP2012078699A (en) * | 2010-10-05 | 2012-04-19 | Sharp Corp | Liquid crystal display device |
US20180203226A1 (en) * | 2015-08-10 | 2018-07-19 | Denso Corporation | In-vehicle display system, control apparatus, and display apparatus |
WO2019106829A1 (en) * | 2017-12-01 | 2019-06-06 | 三菱電機株式会社 | Display unit, display device and display method |
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DE102014110347A1 (en) * | 2014-07-23 | 2016-01-28 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | light guide |
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2021
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- 2021-04-19 JP JP2022527579A patent/JPWO2021241066A1/ja active Pending
- 2021-04-19 CN CN202180039086.7A patent/CN115700005A/en active Pending
- 2021-04-19 US US17/927,127 patent/US11968759B2/en active Active
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JP2007172006A (en) * | 2005-12-19 | 2007-07-05 | Canon Software Inc | Slip generation system, slip generation method, program, and recording medium |
JP2012078699A (en) * | 2010-10-05 | 2012-04-19 | Sharp Corp | Liquid crystal display device |
US20180203226A1 (en) * | 2015-08-10 | 2018-07-19 | Denso Corporation | In-vehicle display system, control apparatus, and display apparatus |
US10558066B2 (en) * | 2016-06-15 | 2020-02-11 | Honda Motor Co., Ltd. | Light shielding device for vehicle that shields light from outside the vehicle |
WO2019106829A1 (en) * | 2017-12-01 | 2019-06-06 | 三菱電機株式会社 | Display unit, display device and display method |
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DE112021002679T5 (en) | 2023-03-09 |
CN115700005A (en) | 2023-02-03 |
WO2021241066A1 (en) | 2021-12-02 |
JPWO2021241066A1 (en) | 2021-12-02 |
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